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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9939487808b3c3fafc8c743658ad71d3ceaf7992588a39040257c5a691e8449' 
  AND token = '+oPvaTaICtgfB1AOqWtqnb5zx/tg+8hWLy6jawROULQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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