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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '024ff5870ee839649b68e4389f38893784e8723c2cf4f780b8a7aad2f0833908' 
  AND token = 'PLnqOvQGjo078lp7urON9cMGISuYSfyjkW4EjAea1jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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