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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87fc2ffd0352a68c2bc62b6b4b38e6b0fdf69b2534b073e342c5a3ee528214a4' 
  AND token = 'e1RkyQQ1VGeJCA9iV5ffxvwf6d1M1Shix9nQ1RzKBME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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