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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e40cf1d7e1e008f0d8016568d1a763b2ee0042033886e6f1a239ffcf71e75377' 
  AND token = 'Ci4o9UJENvdkfmZwPbKNURe0zntN+0LwwHDawj3o1RM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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