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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66909030b2f6a4b13d9fd3b45e3774eea6bd27e63983074268216ef6621e1120' 
  AND token = 'hb0a2zXloMcuNTkkfjQa+DcHzCPGvkZh26lXDOoFZ+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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