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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '307f8c1e0fd6c43e538db40dc68bee7bdf94f11ccf05b23cdaa4980ffb0da02e' 
  AND token = 'nriKtSZgGPWsjpGTJDTl0AfEl+2VSaSyEotX/fQ32z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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