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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91f0192f07fbb5e0707821e9973f667464ec2f8ef88c1ebfb63bbca1752adaa7' 
  AND token = '2o6be2mWbUMm2Y4AfSHARGbRqrzORjR2zFmaBJs2PRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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