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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abeb798bf657203fe0a36cbc3a80861efd14bfedb227fb30faa53fa1e6821e2d' 
  AND token = 'r4GdAjTU6uvX4G+NYei6eQU4zR/urvJKPvYO62erO1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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