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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aeec5862be23649f8fc4aebb7c8aae7b36afd1e80bcbc0d3ceee4d21b8d65a3' 
  AND token = 'bb9im9+A0t1iKyPeZt00OjCzdbJ5cB+zeFwSGYGNs6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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