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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e65ff5a3a994ab0cd630427dee698dd88963a423fda69ca34f349b303de44c40' 
  AND token = 'q7YoWTuhgx87B77eP4vf7hFZ18O8JLCe6aSPNMLaqsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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