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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a30a912d7dd882066b3eadd9364f8662a6c8fed250fc9a1858f9b7075c6bff' 
  AND token = 'N17wLWdzcn/yzboAozg5Mp6UdmArhuq3Cs4qf2Fbnyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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