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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '202b6d03a6c37d6540f267047d2e9803ef2dc345bcda0d933cdee4c763e608fa' 
  AND token = 'WZUk01siKgXoYjULys2VACJKRyr40a0gWhC4pIu+zsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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