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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6919b229bc14ff47237219c4d248da42429a9e72682db87f879ba1b4a7db2634' 
  AND token = 'u+l6oYVRe9o8M36NGVfUXnD/AeBi5In1CtmhDQR3rrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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