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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2faf9985c76594d33c3a62226b6affac5db3e982281ec41e23722d457a670481' 
  AND token = 'g2vXLh5qFLyMM4vhRK4/x4MePw6GO9MnXKK3hCA1SFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}