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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2842c952c7541698f70e5646e6b047268424963caf5a20291c367d99b6a0fd6' 
  AND token = 'jUVZ90ImQIlz4Bd24vi4KuLRRR9+J/9Uh7lfMFa3aho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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