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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffba151b2b605ec8262a958f5a6d06e31743bf3246089c85c34a4a5869e35856' 
  AND token = 'aNL0oLCx4VJRzzH1UuED0T9WvQ9ThFhTwvLTUqgLPag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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