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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffdb0636e66da30a5595fee856446f62914b890822c57ae637bfe86ca3efed1e' 
  AND token = 'Vm/ScdAaB03Ap47lGoBRzmzp5G5FVAiEl1D9LRa5D/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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