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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b94ee0871346175743bbc0414b898e85adbe34ad8a497695e7d50a0142b7d98a' 
  AND token = 'K2bO2xgyZ5q6h9/ZzuIDxBjuDJT6AYR8mk33vprI7i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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