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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70911e8d996893bd184abc7ddcc28074ded2d452f7b57cd90d3799fbc1a26e09' 
  AND token = 'fWynivUpUNqcZgC6UP9dUe+P/xGDLMbN+677qw5Abdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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