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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '925e3625b00949314521e1b3f01ca7394ac8266a5852abd2795a9f834c05306a' 
  AND token = 'hHzXNdS498JLhNrZyXy/Lxc2v5I/QvddWnwcmIu0aqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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