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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89b47d68089b538295bb22e053d3e672eae9a8eaed99f99f5a6eacab02320d02' 
  AND token = 'i+4sjVbumgaAnDLd0plvwzN+jAqeMdNWl6eEV3/J2nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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