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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e25ff7aa5aa03285b0a2ef16cc3182a05143ac3dd2fe58f360af9ce3698ba6e8' 
  AND token = 'ZqTSLu5aXJAEyQBEn9S1TmHPxcYa5KN/I2BeUrvMHaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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