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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26fd914566a6b3423fdead4401228e4c8303f62399c62467de4f53c2c77d0e0a' 
  AND token = 'SBLPW3HfCX24XMOWHJwqA6zaINKiEf7bH6z4yERsaEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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