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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04c0a5f910302c6dda96db69476d49e4aaa8489e931696c4810e3a204d1587a8' 
  AND token = 'd74HJRxUaCHGSGid7yolfrn4+KGnwIQNyZvD7gE9t2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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