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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90bf8db88738fd5012de20e8740a167edd5bfe3475d7553734ccf137a1fae971' 
  AND token = 'tFZNN9wisfol3/3f8Ds9VuyCpbhCoOF1UkelhNMRUnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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