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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c7a8d22662c9e87268b96c6158311410f585233d3e22b15a07b65ceef1257f' 
  AND token = '+Wa/bLhlm0H/6e9c4GeGonASmRXC26QHeZEzEkUHS2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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