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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1a926020841d0662ffdbc3aa8e1ed02d7f9f63f1d676530515c63cc2fb7f3fd' 
  AND token = '7WRUK0Dft45NG8QyYbGlobFfVo+ZS3OYV9snDpdYWJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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