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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca87fb00b7187051cd5690cd6ae9e99a12e1b8b21764ed9e221eab1cdb0193a3' 
  AND token = '309CRLn0/7vVd8lz8E+MXu4k9obPH6GNeNvugQM+6JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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