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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ed537bbee800331d7d448d90993ab318e99d47544efc44a22b370cd036d2d93' 
  AND token = '5cyoCCB5XeTg0L9edno8VRM0oN6drKhTM2uj7RBdxkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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