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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a0b09c90c1a353feea0eecf2447ab0069404193307d352d408ca3eb1696c437' 
  AND token = 'C7FSR3a4zXGPz3DHhBlPiOUpRfv+n+6fXFgph9ajEsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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