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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e1f870aa56f40279911fa8cabd875771af353981e5fe11720b1b95124df14a5' 
  AND token = 'TQwOQ5fi2a1nf4nboxi+kMP+j8X3Nc010Zfre4cioyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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