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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2dcd32092de89bdb3197b418d6b6459395c94e1f39e2535a6cf4dd5e38ad5f2' 
  AND token = 'cf8xU928DTBn2chQSo5AfZMfX95kkVEFhNfJuxxlHQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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