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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '502a5501abf9fa49dca6004f9d21e8b460a28e673804f9d1c5e7e12769706296' 
  AND token = 'y/SDsmHZyS462LzaZe8HBFocd1jTs5SqU1IJ+7ESbBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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