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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18b882e7d7a0b8a9262b313963780035778e5a5d9c778e1fdd4103b962627a2e' 
  AND token = 'oNp7T37oqPFne/0Bcu+fhU9FHwyUlzhTnll3E36lY6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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