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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e09d7ffa59492b96df494f148e71d3a4bc3a10707c9d01bb897b5e807168949b' 
  AND token = 'jomet0R2xXQEY6o8od4AyiDu7W3fx9o4EBb92D3/mag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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