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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2fe5d802319b38668e0b27bdef91ba2c210dc9d83ab12ceac1cf36a5c18b2ba' 
  AND token = 'Vx0yJ2mkvXTHrZuBP3LR3PduI0AgY244EVskf3hisFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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