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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41fb385a42093bf4c4e304fb4f2e68138e63ab395cfae74d1fd369e25af3c962' 
  AND token = 'NDi4wlGzHLXPbjLGpv5dcBU2Q33UWxIcOR7vaVq2ihw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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