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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '530261567ced426cdc5475b6e61a01b26777009288220756402d4a94a93b4305' 
  AND token = 'CskQIb29pOE/mor/0gaXxuCCF1tXjOYnN34ZGPosV4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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