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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34ed3258155c9c3a3f903054d0d93bb9dc84794df4205a2b38dfb36812195832' 
  AND token = 'cYQtVH9rWWE/5LWQzDIjikQ0ZpQ9QpqfY2BV0zVGwWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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