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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9b593c307a6e8eb51b5d947e0678ba965dcc9077315124a0468cc3b3140d793' 
  AND token = 'g1UIF8OGT2AmS/5igsaCx/0bs+oSaGwWSox8X4KxZO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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