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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a144686f4de7e9e7488237e29b60e598d434c54f0cd48bf49aaf0a7e5d1430c' 
  AND token = 'dEaySs4dS7cu5d5584si2mwvuJQCVziE32uvSaGwKlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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