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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cbb77e2c623755ecef3f0d33e06c11dcf319107d0ee734a00c2c08bbbe1799f' 
  AND token = 'jDhLwT90DLxD5bSkm8WJBOBpI03q7QpGS9X4kAm8cyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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