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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e64fe945729155e012e4d1e3e578250f230f74f98d475bc9791e2a0857d45e4' 
  AND token = 'W+6aygUdKiIciDYs5fMJggyt8ziLBOG/i8hRo7c/XgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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