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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b064850b0f9b72978e1da66df634a7f9bb5e59288ebb5c52952b289670fe5e41' 
  AND token = 'Di4giBo7wLNpWPYcscYSQp0AzkhC3oT+iGsL0os8+WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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