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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69da98c6271d714e5e6e03677df5835b4b6682fc5c564dcdd4279f669e087a00' 
  AND token = '04C1Ty2IeOcUqDTOAOWZUruT1mgQnp2ohhPHpmleCEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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