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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8049ee260daf4d159317ac12ae8384006e90d11ff8cbee6c1bfed938d7831bd0' 
  AND token = 'lNSPJD9pcLZremhqgxOW+YfHFL2fqhVj1+GfUecua+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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