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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5c740b3e31ff920ad9710940b5e1f0898f1c5d0911c5e0e83fbcf7e0cfcc8d5' 
  AND token = 'TECTPrp8qGJV8TsWId/WSDI5LWni6e1adfviw2dXVqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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