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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9637d31edc79b8a59fdec1f5ee23a6baf6b5a6c32fee4b557991ab103fa8795' 
  AND token = 'hRvaYPECs7duTdRehyDjuxtaYxIA9CX/OF0d1a0N3tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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