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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30eb8cf6a6bb0dee9e0b8d7aa581151564b48506c4aa41d563a23c3e9d0eb6a1' 
  AND token = 'asijl9fd1SyJlwCyIRimtkX1gXi8B7k3IAIW55b7fQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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