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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c90e89bc694e0d846da3bee9afc8d6c59fc6a4a2348ca4413a25dc4d94218c1f' 
  AND token = 'OtewixbFAII2KiwHHberiYeGHd8Bg3i/q4QeVerydvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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