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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '305dd43f3a630903660f6fe4f49bf3589150f62f4a7bacb6cf1d4c5d9ad47a97' 
  AND token = 'ynIE5k35uYG6HKbAyJ1dBX3+h6psmmgMm6gtEN7l/CI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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