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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec4beff464c477325500613004e63add309c23e45bbcf4de36d78d8005a42989' 
  AND token = 'RkgwFB+P+JnUcW+We7gGPH8UDAQLL/hB/h1R5AWcJCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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