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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90eab1bbded6285c9e507d1631b0e6945826570a065ee64cdc47c206e37568b6' 
  AND token = '+Rw3DLw9Yha4wwyZTUk1eVrqjoVpP4qioT6fzrVOXcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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